The good news is that most plants will bounce back between 7-14 days if they're given proper care (which includes rehydration). If this isn't possible because major damage was done or little healthy root system exists then expect about 2 weeks until improvement can be seen.
Look out for signs of overwatering – including a limp plant, yellowing leaves, or dropping leaves. If you see these signs, test the soil with your fingers. It should be pretty obvious if it's soggy! Stop watering and let the soil dry out.
If you think your plant is overwatered, take a break from watering it. Otherwise, the problem will continue to get worse. Don't add more water to the pot until you're sure the roots and soil are dry. This can take several days, so don't worry if there's a big gap between waterings.
To dry out soil quickly, you can apply hydrated lime to the soil, add compost and then turn the soil thoroughly to aerate it.
Signs of root rot are slow growth, mushy stems, and wilting, yellow, distorted leaves (especially when the plant has been well watered, as wilting leaves can also be a sign of a dry plant).
You might think that sticking your plant in direct sunlight will help with the drying out process once it's been overwatered – but don't do it! Keep your plant out of all direct sunlight until you've resolved the issues caused by overwatering.
Yellow Leaves + Fading to Green + or Bright Yellow =
These symptoms together mean that your plant is overwatered. Usually lower leaves drop first, although the whole plant may be affected. The solution = repot (to remove soaked soil) and water less, or let soil dry out and water less.
1. If a plant is overwatered, it will likely develop yellow or brown limp, droopy leaves as opposed to dry, crispy leaves (which are a sign of too little water). Wilting leaves combined with wet soil usually mean that root rot has set in and the roots can no longer absorb water.
Plants growing in soil that is too wet suffer from a lack of oxygen which leads to the death of roots and a loss of vigor in the plant. Stunted slow growth with yellowing leaves is a symptom of over watering. Plants may suffer from leaf scorch or leaf burn.
A wilted plant can recover in a few weeks with the right care and attention to address the root cause of wilting. It is worth noting, however, that not every wilted plant has the stored energy to make a full recovery, and some plants can take months to look as they did originally.
In the most extreme cases, when conditions are ideal for the fungus to spread quickly, plants can die within 10 days. If these symptoms occur in a plant, loosen the soil around the base of the plant with a hand trowel or shovel and remove the plant from the soil.
Underwatering your plants will result in limp and wilting leaves. Your plants must have enough water to pass through the cells for turgor. If there isn't enough water, the plant will not only wilt but also close its stoma to prevent evaporation.
One of the quickest, first signs of overwatering your plants is to observe occurs at the tip of the leaf. If the tip of the leaf is turning brown this is a sign of overwatering. Too little water will result in your plant's leaves feeling dry and crispy to the touch while too much water results in soft and limp leaves.
When you see an entirely yellow leaf, you should remove it from your plant using a sterile cutting tool. Removing the leaf will let the plant focus its nutrients on healthy leaves. A yellow leaf has lost its chlorophyll (pigment) and it can't turn green again even after you correct the problem.
Epsom Salt for Plants
Aside from the anecdotal evidence about human benefits, Epsom salt does seem to help plants. Generations of gardeners have said it helps their plants grow bushier, produce more flowers and have better color. It's also said to help seeds germinate and repel slugs and other garden pests.
The heat of summer can be a death sentence for your plants, but over watering can as well. The best thing you can do is keep the soil moist by watering when the top 1 inch (tip of your finger) feels dry to the touch and to be aware of the symptoms listed above.
Hydrogen peroxide can help to control fungal growth and fungal infection, such as root rot, by preventing the growth of fungi. It can also help kill fungus and bacteria on plant roots.
Unfortunately, if the root rot is left for too long and there are no remaining healthy roots, your plant can't recover.
If the soil clings to your fingers and feels moist to touch, don't water. If, soil falls loosely off your fingers and is dry to the touch, then water.
– Manually Dry Out
Otherwise, manually dry out the soil by using a hair blow dryer, but of course, you will have to remove the plant from the pot so that every section of the root and the soil is dried out.